51results about How to "Enhanced cycle life performance" patented technology

A composite anode active material includes a composite of a carbon-based anode active material, a metal-based anode active material and polymer particles. By increasing the conductivity of the composite anode active material, a lithium battery having a large capacity, high initial efficiency, high rate capability and improved cycle life performance can be obtained. An anode includes the composite anode active material and a lithium battery includes the anode.

A positive active material for non-aqueous electrolyte secondary battery is provided comprising lithium manganese oxide having such a spinel structure that the half-width (2θ) of the reflection peak corresponding to 440 plane as determined by X-ray diffractometry using CuKα ray is not greater than 0.145°. The use of this positive active material makes it possible to obtain a secondary battery which exhibits a good cycle life performance at room temperature and high temperatures and a reduced capacity drop when stored at high temperatures.

Each of battery cells (12) that constitute a battery module includes a flat-shaped rolled electrode body (30) formed by rolling a sheet-like anode collector (32) and a sheet-like cathode collector (34) along with a sheet-like separator, and a trailing edge (32E) of the sheet-like anode collector (32) and a trailing edge (34E) of the sheet-like cathode collector (34) are located at a position (30B) outside a portion of the rolled electrode body (30) which substantially receives a restraining load. The battery module, in which the restraining load is applied to the cells, achieves long service life while maintaining good output characteristics.

The invention discloses a processing technology of a lead crystal battery positive pole plate. The processing technology comprises the following steps of adding 4BS seed crystal in an amount of 1-2wt% of positive lead paste formula during preparation of positive lead paste; coating the lead paste on a surface of a grid to generate a green plate, and employing the following curing and drying process that 1) humidity is 99-100%, a temperature is 65-75 DEG C, an air speed is 25-35%, and time is 4-8 hours; 2) the humidity is 90-98%, the temperature is 65-75 DEG C, the air speed is 35-55%, and time is 12-24 hours; 3) the temperature is 65-75 DEG C, the humidity is 30-50%, the air speed is 35-55%, and time is 12-24 hours; and 4) the temperature is 65-75 DEG C, humidification is stopped, the air speed is 70-100%, and the time is 12-24 hours. The content of the 4BS crystal of the positive pole plate prepared by the technology accounts for 40-60%, and the length of the 4BS crystal is 10-20 micrometers; and when the 4BS crystal is prepared to form the lead crystal battery, the capacity of the battery can be effectively improved, and the cycle lifetime of the battery can be effectively prolonged.

In method for preparing active material of cathode in use for lead accumulator, 0.5 - 1.5%Wt lignin and 0.5 - 5.0%Wt carbon related to lead powder are added to lead powder. In method for preparing cathode in use for lead accumulator through coating lead powder on basal body, 0.5 - 1.5%Wt lignin and 0.5 - 5.0%Wt carbon related to lead powder are added to lead powder. The lead accumulator prepared according to the disclosed method possesses good performance of charging and discharging cycle lifetime in high temperature.

The invention provides a lithium battery electrolyte. The lithium battery electrolyte comprises lithium salt, a carbonate organic solvent, a carboxylate organic solvent, a silicon-carbon-type functional additive and other film-forming additive, wherein the molar concentration of the lithium salt component in the lithium battery electrolyte ranges from 0.1-2mol/L; the molar concentration of the other film-forming additive component in the lithium battery electrolyte ranges from 0-0.5mol/L; the mass percentage of the silicon-carbon-type functional additive component in the lithium battery electrolyte ranges from 1-10%. According to the technical scheme adopted by the invention, the stability of the electrolyte in a silicon-carbon-type lithium battery is improved, expansion of the lithium battery is suppressed, and thus the cycle life of the lithium battery is prolonged.

A negative electrode current collector for a lead-acid battery having a grid part, upper frame part, and lug part according to the present invention, where the upper frame part and lug part have a surface layer, a surface layer is an alloy of Pb and Sn and the mass ratio of Sn accounts for 10% or more in the whole alloy, an alloy of Pb and Sb and the mass ratio of Sb accounts for 10% or more in the whole alloy, an alloy of Pb, Sn and Sb and the total mass ratio of Sn and Sb accounts for 10% or more in the whole alloy, Sn, or Sb.

Further, a negative electrode current collector for a lead-acid battery having a grid part, upper frame part, and lug part according to the present invention, only upper frame part and lug part have a surface layer.

A hydrogen storage alloy is provided which, when used in a battery, has high drain (power) performance and charge acceptance that are excellent, and in addition, cracks are few, and cycle life performance are excellent, to be used in large batteries, in particular for electric vehicles, hybrid electric vehicles, high-power use, and the like. The hydrogen storage alloy is a hydrogen storage alloy having phase conversion accompanying the variation of hydrogen storage capacity (H/M) and is in a single phase or in a state close to a single phase when the above-mentioned hydrogen storage capacity (H/M) is in a range of 0.3 to 0.7 or 0.4 to 0.6.

The present invention provides a non-aqueous electrolyte secondary battery comprising a positive electrode, a negative electrode comprising a carbonaceous material, an organic electrolyte comprising a lithium salt and a solvent, and a separator. The solvent comprises ethylene carbonate (EC), propylene carbonate (PC), a chain carbonate and phenylethylene carbonate, the content of the chain carbonate, ethylene carbonate (EC) and the propylene carbonate (PC) are from 50 to 90 vol %, from 5 to 45 vol % and from 5 to 45 vol %, respectively, based on the total volume of the ethylene carbonate (EC), the propylene carbonate and the chain carbonate, and the content of the phenylethylene carbonate is from 0.1 to 5.0 wt % based on the total weight of the electrolyte. The non-aqueous electrolyte secondary battery according to the invention exhibits a great discharge capacity, an excellent cycle life performance and an excellent low-temperature discharge performance.

The embodiment of the present invention relates to a secondary battery, a battery pack and a vehicle. The secondary battery, the battery packwith the secondary battery, and the vehicle with the battery pack, which are provided by the invention, are excellent incycle life performance. According to one approach, a secondary battery is provided. The secondary batteryincludes a negative electrode including a negative electrode current collector, a negative electrode terminal electrically connected to the negative electrode current collector, a joint electrically connecting the negative electrode terminal and the negative electrode current collector (3a), and a water repellent layer covering the joint. The joint is covered with the inner surface of the water repellent layer. A contact angle theta with respect to water on an outer surface of the water repellent layer satisfies theta <= 80 degrees.

The invention discloses solid electrolyte for a dye-sensitized solar cell. The solid electrolyte comprises the following components in parts by weight: 30-40 parts of benzonitrile type alkynyl quaternary ammonium salt ionic crystal, 20-30 parts of 3-cyanobenzyl tripropargyl quaternary ammonium salt organic ion, 2-5 parts of ferrocenyl-acetenyl, 1-3 parts of cyanoacetylene, 4-8 parts of elemental iodine, 4-8 parts of iodate and 5-10 parts of additives. The preparation method of the solid electrolyte for the dye-sensitized solar cell comprises the following steps: heating, melting, uniformly stirring to form a mixture, adding the elemental iodine and additives, heating, melting and uniformly stirring, cooling and curing. According to the solid electrolyte for the dye-sensitized solar cell disclosed by the invention, leakage and volatilization problems can be effectively solved, and the electrolyte is high in electrical conductivity and has obvious effects in improving the stability and photovoltaic conversion efficiency of the dye-sensitized solar cell and prolonging the service life cycle.

A negative active material is characterized by being prepared by adding a lignin having a unit structure represented by the formula (I) as the main structure to a lead oxide. Since the lignin of the formula (I) is added, the negative active material can be prevented from shrinkage due to charge/discharge.

(wherein R₁ is H, OH, COOH, SO₃H, SH, C₆H₅, COO⁻, SO₃⁻, R₂C₆H₄, (R₂)₂C₆H₃, or (R₂)₃C₆H₂; and R₂ is at least one member selected from among OH, COOR, SO₃H, and CH₂SO₃H.)

The invention discloses an electric vehicle charging method and system. The method comprises the steps of substituting battery information and charging time of an electric vehicle into a secondary control center optimization model for calculation based on each secondary control center; substituting the calculation result and the predicted output of new energy power generation into a two-stage optimization model for calculation to obtain a load guidance curve of each secondary control center; formulating a charging load following guidance curve of each electric vehicle under the secondary control center based on the load guidance curve; and charging the electric vehicle according to the charging load following guidance curve. According to the invention, the orderly charging load following method for the electric vehicle can be embedded into a hierarchical control method, and the write control problem of electric vehicle charging and clean energy power generation can be solved by means of the hierarchical control method, so that the charging behavior of the electric vehicle can be better matched with intermittent new energy power generation, and thus economic benefits and social benefits are created for the society, the power grid and electric vehicle operators.

The invention discloses a charging strategy and system for large-scale electric vehicles distributed in a wide area. The charging strategy for the large-scale electric vehicles distributed in the widearea comprises the following steps: battery information and charging time of the electric vehicles are brought into optimization models of secondary control centers and calculated on the basis of thesecondary control centers; calculation results and predicated output of new energy power generation are brought into a two-stage optimization model and calculated to obtain load guidance curves of the secondary control centers; a charging load following guidance curve of each electric vehicle under the corresponding secondary control center is formulated on the basis of the corresponding load guidance curve; and the electric vehicles are charged according to the charging load following guidance curves. According to the charging strategy and system for the large-scale electric vehicles distributed in the wide area, the strategy of ordered charging load following of the electric vehicles can be embedded into a hierarchical control strategy, and through the hierarchical control strategy, thepurpose of writing cooperation control over the large-scale electric vehicles distributed in the wide area during charging, and clean energy power generation can be achieved, so that a charging behavior for the electric vehicles can be better matched with the intermittent new energy power generation, and then economic benefits and social benefits are created for the society, power grid and electric vehicle operators.

Disclosed herein are electrolyte compositions comprising at least one electrolyte component comprising a cyclic carbonate, such as a fluoroethylene carbonate, and at least one additive comprising a 6-member ring heterocyclic sulfate, such as a 1,3 propylene sulfate. The disclosed electrolyte compositions can comprise additional electrolyte components, such as fluorinated acyclic carboxylic acid esters, and additional additives, such as lithium boron compounds, and cyclic carboxylic acid anhydrides, such as maleic anhydride. The improved battery performances, which include high temperature cycling conditions and/or room temperature stability, make these electrolyte compositions useful in electrochemical cells, such as lithium ion batteries.